Number of records to show that are before and after the matched record

<div class="definition">
    Integer, default = 0
</div>

Once the search is applied, sometimes it is useful to know what records are before andr after the searched record
(to know the context).
<div style="height: 10px"></div>

This property can be set during object creation:
<textarea class="javascript">
let grid = new w2grid({
    name: 'grid',
    showExtraOnSearch: 1,
    columns : [
        { field: 'recid', text: 'ID', size: '50px' },
        { field: 'lname', text: 'Last Name', size: '30%' },
        { field: 'fname', text: 'First Name', size: '30%' },
        { field: 'email', text: 'Email', size: '40%' },
        { field: 'sdate', text: 'Start Date', size: '120px' },
        { field: 'sdate', text: 'End Date', size: '120px' }
    ]
});
</textarea>

Or any time during run-time:
<textarea class="javascript">
w2ui.grid.showExtraOnSearch = 1;
</textarea>
